Automatic safety gas-lock.



R. A. MACK.

AUTOMATIC SAFETY GAS LOOK. APPLICATION FILED JUNE 19, 1911.

1,008,839, Patented Nov. 14, 1911.

WITNESSES: [/VVE/V 70k BY I v Allorneyr COLUMBIA PLANOGRAPH co.,WASHINGTON D c RUDOLPH A. MACK, 0F GALLIPOLIS, OHIO.

AUTOMATIC SAFETY GAS-LOCK.

Specification of Letters Patent.

Patented NOV. 14:, 1911.

AppIication filed June 19, 1911. Serial No. 633,977.

To all whom it may concern Be it known that I, RUDOLPH A. MACK, a

citizen of the United States, residing at Gallipolis, in the county ofGallia and State of Ohio, have invented certain new and usefulImprovements in Automatic Safety Gas- Locks, of which the following is aspecification.

This invention relates to automatic safety cut oifs for gas jets or thelike and the purpose is to provide a device of the above class whichwill be eflicient in operation and of a simple construct-ion and whichmay be readily used at any part of a gas pipe or at a gas jet to preventaccidental escaping of gas, should the gas pressure fall and the gasflame thereby be accidentally extinguished and the gas again rise inpressure. This object is reached in this invention by the use of apiston valve located in the gas passage, which piston will fall with thegas pressure below a locking catch, which will prevent the piston valvefrom again rising with the gas pressure until the safety cut off isrendered inoperative by use of a cam shaft.

Another object is to provide a side passage in the safety lock, oppositewhich the piston valve will rise and remain under normal gas pressure.

With the above and other objects in view, this invention consists in theconstruction, combination, and arrangement of parts, all as hereinaftermore fully described, claimed, and illustrated in the accompanyingdrawings, wherein- Figure 1 is a longitudinal section of the presentdevice; Fig. 2 is a section on line 22 of Fig. 1; and Fig. 3 is asection on line 33 of Fig. 1.

Throughout the following description and on the several figures of thedrawings, similar parts are referred to by like reference characters.

Referring to the drawings, 1 designates a cylinder having an eccentricbore 2 threaded at opposite ends to receive the usual gas pipe sectionsindicated at 3.

At 4 is indicated a transverse recess cut through the thick side of thecylinder, in which recess is a pivoted catch 5, said catch beingoperated by the eccentric portion of a cam shaft 6 journaled foroperation transversely passing through the recess 4. Communicating withthe recess 4 and extending parallel with the main bore 2 is a bore 7extending upwardly to a point 8 where the said bore is cut into thecylinder. piston valve 9 snugly fitting the bore 2 of the cylinder 1 is,under normal gas pressure, elevated in the cylinder to a point oppositeto the side-passage 7 through which the gas will escape and be suppliedfor use in an ordinary manner, as for instance, a gas jet.

Should the gas fall below normal pressure sufficiently, the piston valve9 will fall in the gas passage below the locking catch 5 by which thepiston valve will be prevented from again rising, if the pressure risesin the passage, until the locking device is rendered inoperative by theturning of the cam shaft 6. The transverse recess 4 is closed atitsouter end by a plate 10. Thus it will be seen that accidental escapingof gas would be prevented if a gas flame receiving its supply from thepassage in which this locking device is located should becomeextinguished by falling gas pressure and should the gas again rise inpressure.

Having thus fully described my invention, what is claimed as new is 1. Asafety cut-off having a main bore and a recess intermediate the ends ofsaid bore, and having a side bore communicating with said recess andwith the main bore adjacent the upper end thereof, a catch pivoted insaid recess and normally extending into said main bore and having anextension, a pressure operated valve in said main bore under normal gaspressure elevated to apoint opposite said side-bore and with diminishinggas pressure falling below said catch, and a cam shaft cooperating withthe aforesaid extension to withdraw said catch from the main bore,thereby rendering the lock in operative.

2. A safety cut-off consisting of a cylindrical body having an eccentricbore, the opposite ends thereof being adapted to receive gas pipes, arecess formed transversely through the thick wall of said cylindricalbody, a side bore extending upwardly from said recess and opening intothe aforesaid eccentric bore adjacent the upper end thereof, a catchpivoted in said recess adjacent to said eccentric bore, and normallyprojecting into said eccentric bore at a point below the pivot andhaving an extension projecting toward the outer end of said recess, acam shaft extending transversely through said recess and said extensionresting thereon, a In testimony whereof I aflix my signature plateclosing the outer end of said recess, in presence of two Witnesses. anda pressure operated valve normally located at a point opposite the sidebore and RUDOLPH A. MACK. adapted to fall below said catch with di- I gminishing gas pressure, said cam shaft be- Witnesses:

ing adapted to Withdraw-the catch from the CHARLES L. BROWN,

bore, thereby rendering the lock inoperative. CHRISTIAN HENKEL.

Copies of thispatent may be obtained for five centseaeh, by addressingthe Commissioner of Patents; Washington, D. G.

